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-rw-r--r--src/src/functions.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/src/functions.h b/src/src/functions.h
index 060278959..de03bb8d0 100644
--- a/src/src/functions.h
+++ b/src/src/functions.h
@@ -186,7 +186,7 @@ extern void delivery_re_exec(int);
extern BOOL directory_make(const uschar *, const uschar *, int, BOOL);
#ifndef DISABLE_DKIM
-extern uschar *dkim_exim_query_dns_txt(uschar *);
+extern uschar *dkim_exim_query_dns_txt(const uschar *);
extern void dkim_exim_sign_init(void);
extern BOOL dkim_transport_write_message(transport_ctx *,